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Screens and depth...

A

Anonymous

Guest
I really feel rejecting areas causes loss of depth. Accepting all makes for a noisy machine hearing all and actually seen some nice overlays to tape over screen...nice part of Explorer so many ways to setup and all seem to work in their own way so I would guess no right or wrong way, just one that works for you in your area.
 
I prefer to hunt with all metal and originated the ZDAM program for the DFX. I also believe rejecting any metal will cost some depth. I guess I would have to see something very solid to get me to believe there is absolutely no loss.
HH, Cody
 
Indeed all metal modes although noisy do go deeper many use them incorporated with tone ID for more depth. Not into testing with recently buried coins but in the field where it counts..
 
I'm a rookie and not an electronics guy and I have often heard that using more discrimination results in loss of detection depth...why is this so? Just trying to learn, thanks, Ray in Waco, TX.
 
Basically unit has to work harder to discriminate and effects depth in many units.Am sure some of our learned individuals with Electronic backgrounds can give a more detailed explanation after using many units in the field and experimenting in field conditions( get a deepie with low discrimination, change your unit to high discrimination and many times with the high discrimination its non exisent or at least barely audible)..looking for some pro input on this one..
 
If we hunt in all metal we are only interested in hearing all targets that are not the soil matrix. The explorer uses a very interesting method to ignore the current induced into the soil and only look a the ones from a target. All we care about is rejecting the soil matrix and then hearing all targets.
In discrimination all target are still present in the receiver circuits. The deeper a target is the less eddy current is induced into the targets. For discrimination to be effective we have to have some standard of what is a good or bad target. The deeper and fainter targets are more difficult to separate into good or bad so in order to discriminate we must make a decision as what to report as such. A large piece of trash metal in some states of decay at great depth will produce a good target report as an example. There is a algorithm used by engineers to program the microprocessor with code that instructs the microprobes as to what to accept as a good target and what to throw out. The faint very deep iron target is thrown away but some faint good targets are thrown away because we get back to the point of detecting all metal.
So you see where this goes. All metal does not need to make many decisions other than external noise from stray RF and ironstone, if you like that term so will report all faint deep target with a tone or some other indication. The faint deep targets are actually detected in discrimination but are thrown out. The trick is and has been a quest for many years is how to get the ratio and % of thrown away targets to zero. In that situation then all metal and discrimination would detect to the very same depth.
Bottom line is detection depth is the same but in all metal nothing is thrown away except for ground mineral signals and other external noise. Discrimination must throw out some faint deep targets to be effective as a discriminator. Recall the complaints by some users about machines being iron lovers.
 
The worst problem with all metal is indeed the noise. I will end up in Semi-auto at times for this reason. There is a dramatic difference in IM-16 external noise even with noise cancel and discrimination. However, all metal in semi-auto is just a solid as discrimination in manual.
Good observation.
HH, Cody
 
Then maybe running wide open or with low disc you may get a peep from it. But then again the iron may steal the hit anyway.
With my other brand name detectors in the past I've used I noticed a dramatic decrease in depth the more I cranked up the disc. But when I change my usual IM-10 to IM-16 and hit a site I already pounded I rarely find too much which tells me the explorer went just as deep with disc set at IM-10 than with the new setting of IM-16.
HH,
Greg
P.S. I swing very slow in trashy areas, concentrate, and thoroughly cover an area. Doing this with an explorer will get you most everything in any setting in my opinion <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)">
 
You are making some good points. If you take into consideration the trade offs I am not at all sure there is much difference. It may well be so small as to not be worth considering.
I am not sure why it is not talked of more but the Explorer is a form of a PI detector. It is correctly classed as a subgroup of PI detectors. The basic groups are SF, MF, PI which has a subgroup of TD.
<span style="background-color:#ffff00;">SF-Single Frequency </span>(MXT is an example.)
<span style="background-color:#ffff00;">MF-Multiple Frequency</span> (DFX is an example.)
<span style="background-color:#ffff00;">PI-Pulse Induction </span>(We know these of which most or underwater detectors.)
<span style="background-color:#ffff00;">TD-Time Domain which is retangular pulsed time domain. </span>(Explorer series, Sovereign, are examples.)
The Explorer is a very unique machine and as such does some great things when it comes to discrimination and depth. I use IM-16 and one reason is I prefer to not hear the null associated with discrimination.
It appears to me that they keep the null from the threshold from being too great. All we need for null discrimination is to just drop below sound. I have also tested that and see very little difference. It might make some on very deep faint targets but is one reason why we have FAST and DEEP.
HH, Cody
 
Though I switched DEEP off for a month or so and noticed no difference in my quantity of finds nor any added depth on them. I have excellent hearing though and am pretty good at hearing a variable tone next to another target and discerning that there are 2 targets in close proximity of one another. So DEEP on may help someone who's hearing isn't 100% but I figure I might as well keep it on.
 
I wonder if FAST+DEEP ON may be a good combination if one uses Semi-auto. Semi-auto might tend to tune out an ultra deep target but FAST+DEEP ON would allow us to catch the target.
HH, Cody
 
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